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  Two- and Three-Dimensional Superconducting Phases in the Weyl Semimetal TaP at Ambient Pressure

Van Delft, M. R., Pezzini, S., König, M., Tinnemans, P., Hussey, N. E., & Wiedmann, S. (2020). Two- and Three-Dimensional Superconducting Phases in the Weyl Semimetal TaP at Ambient Pressure. Crystals, 10: 288, pp. 1-12. doi:10.3390/cryst10040288.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-52C3-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-52C5-F
Genre: Journal Article

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 Creators:
Van Delft, Maarten R.1, Author
Pezzini, Sergio1, Author
König, Markus2, Author              
Tinnemans, Paul1, Author
Hussey, Nigel E.1, Author
Wiedmann, Steffen1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Markus König, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863470              

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Free keywords: Focused ion beam, Superconductivity, Weyl semimetal
 Abstract: The motivation to search for signatures of superconductivity inWeyl semi-metals and other topological phases lies in their potential for hosting exotic phenomena such as nonzero-momentum pairing or the Majorana fermion, a viable candidate for the ultimate realization of a scalable quantum computer. Until now, however, all known reports of superconductivity in type-IWeyl semi-metals have arisen through surface contact with a sharp tip, focused ion-beam surface treatment or the application of high pressures. Here, we demonstrate the observation of superconductivity in single crystals, even an as-grown crystal, of the Weyl semi-metal tantalum phosphide (TaP), at ambient pressure. A superconducting transition temperature, Tc, varying between 1.7 and 5.3 K, is observed in different samples, both as-grown and microscopic samples processed with focused ion beam (FIB) etching. Our data show that the superconductivity present in the as-grown crystal is inhomogeneous yet three-dimensional. For samples fabricated with FIB, we observe, in addition to the three-dimensional superconductivity, a second superconducting phase that resides on the sample surface. Through measurements of the characteristic fields as a function of temperature and angle, we are able to confirm the dimensionality of the two distinct superconducting phases. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

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Language(s): eng - English
 Dates: 2020-04-102020-04-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.3390/cryst10040288
 Degree: -

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Title: Crystals
Source Genre: Journal
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Publ. Info: Basel, Switzerland : MDPI AG
Pages: - Volume / Issue: 10 Sequence Number: 288 Start / End Page: 1 - 12 Identifier: ISSN: 2073-4352
CoNE: https://pure.mpg.de/cone/journals/resource/2073-4352